EDP Foz Tua: Bivalvia – Complementary Studies [2011]

說明

資料紀錄

此資源sampling event的資料已發佈為達爾文核心集檔案（DwC-A），其以一或多組資料表構成分享生物多樣性資料的標準格式。 核心資料表包含 31 筆紀錄。

亦存在 1 筆延伸集的資料表。延伸集中的紀錄補充核心集中紀錄的額外資訊。 每個延伸集資料表中資料筆數顯示如下。

此 IPT 存放資料以提供資料儲存庫服務。資料與資源的詮釋資料可由「下載」單元下載。「版本」表格列出此資源的其它公開版本，以便利追蹤其隨時間的變更。

版本

以下的表格只顯示可公開存取資源的已發布版本。

如何引用

研究者應依照以下指示引用此資源。:

Reis J, Rodrigues P, Pires D, Pinheiro P, Madeira J, Múrias T (2018): EDP Foz Tua: Bivalvia – Complementary Studies [2011]. v1.2. EDP - Energias de Portugal. Dataset/Samplingevent. http://ipt.gbif.pt/ipt/resource?r=edp_tua_bivalves_cs&v=1.2

權利

研究者應尊重以下權利聲明。:

此資料的發布者及權利單位為 EDP - Energias de Portugal。 This work is licensed under a Creative Commons Attribution (CC-BY 4.0) License.

GBIF 註冊

此資源已向GBIF註冊，並指定以下之GBIF UUID: 08516469-1a7c-42fe-800b-f864d4521f71。  EDP - Energias de Portugal 發佈此資源，並經由GBIF Portugal同意向GBIF註冊成為資料發佈者。

關鍵字

Occurrence; Observation; freshwater bivalves; Bivalvia; Unio delphinus; Anodonta anatina; Margaritifera margaritifera; Potomida littoralis; Corbicula fluminea; Sphaerium corneum; Pisidium casertanum; Pisidium personatum; Pisidium subtruncatum

聯絡資訊

地理涵蓋範圍

The data was collected at 30 field stations along the valleys of rivers Tua, Tuela and Rabaçal (Northeast Portugal, Europe), within the municipalities of Alijó, Carrazeda de Ansiães, Mirandela, Macedo de Cavaleiros and Valpaços.

分類群涵蓋範圍

The taxonomic coverage of this dataset spans 1 class, 2 orders, 4 families and 8 species. All individuals were identified to the species level.

時間涵蓋範圍

計畫資料

The dataset contains records of freshwater bivalves (Mollusca, Bivalvia) collected in the rivers Tua, Tuela and Rabaçal, which are included in the Complementary Studies to the Environmental Impact Assessment of the Foz Tua Hydroelectric Dam, promoted by EDP – Energias de Portugal, S.A. Data were collected in July and October 2011, during field visits to 30 fixed stations.The main taxa targeted during the field visits were species from the families Unionidae, Margaritiferidae, Sphaeriidae and Cyrenidae. A total of 2072 specimes were identified, of which 1055 Unio delphinus, 329 Corbicula fluminea, 314 Anodonta anatina, 295 Potomida litoralis, 20 Margaritifera margaritifera, 48 Pisidium nitidum, 8 P. casertanum and 3 P. subtruncatum.

參與計畫的人員:

取樣方法

Sampling was designed to obtain complementary data: (1) a general characterization of the freshwater bivalve communities (presence/absence and Capture per Unit Effort only), using 19 field stations located every 2 km in the lenthic zone (lower Tua) and every 5 km in the lothic zone (upper Tua and lower Tuela and Rabaçal), totalizing 31 field stations, and (2) a detailed characterization aiming to quantify the abundances at community and population levels, using a restricted number of field stations (5 in river Tua, 2 in river Tuela and 1 in river Rabaçal), roughly 10 km apart. The method used to perform the general characterization of the communities was random visual search of the river bottom in each field station, using “snorkeling” in clear water of less than 1 m deep. All bivalves found were counted, identified, measured (shell length) and weighted, before being returned to the habitat. A relative count (number/hour/observer) of all bivalves present was made in each field station. The characterization of the riverbed substrate was included, by estimating the relative proportion of rock, pebble, gravel, sand and mud present), as well as a characterization of the riparian vegetation, using a simplified version of the River Habitat Survey (RHS) methodology. To sample small bivalves fully buried in the substrate (sphaeriidae: genus Pisidium, Sphaerium and Musculium; Cyrenidae: genus Corbicula; Unionidae and Margaritiferidae: juveniles only) a modified kick-sampling method was applied using a hand net of 0.5 mm mesh in suitable habitats for these specimens (fine sediments near the margins, roots, underwater vegetation, etc). The captured specimens were sorted and preserved in 96% alcohol for subsequent identification in the lab. The results (presence/absence, total numbers and relative numbers) were used to define homogeneous sectors of rivers regarding the bivalve communities, either by using objective landmarks (e.g., small dams, orographic features, confluence of two water lines), or subjectively, using the station or the medium point between stations. For detailed characterization, 10 transects of 1 m wide perpendicular to the river (independently of the river’s width) were surveyed in each station by 2-3 technicians by scuba diving. All animals found were identified, counted and processed as above. These data were used to estimate the densities present in each station (expressed as number of bivalves/100 meters of river, by multiplying the number of captures for all transects combined by 10). The number of individual per sector of river (as defined above) was found by multiplying the average value of abundance per 100 m of river from the various stations of a given sector by the coefficient corresponding to the length of that sector (for example, for a sector of 10 km multiplied by the factor 100).

方法步驟描述:

1. To be completed

額外的詮釋資料